Migrants hide under a freight car in Coquelles near Calais pm on their way to the Eurotunnel on 12th August Getty Images

The number of migrants trying to break into the Eurotunnel terminal near Calais has fallen dramatically since the introduction of extra security measures, the operator has said.

At its peak near the end of July, some 2,000 desperate migrants were trying to access the tunnel to reach Britain in a single night.

Eurotunnel said the number had fallen to about 150 after the UK government paid for additional fencing, floodlighting, infra-red detectors and CCTV cameras.

But it said the number still remained “unacceptable”, and French police said the measures were only a “short-term solution” which did not solve the main issue of what to do with thousands of migrants living in desperate conditions in camps outside Calais.

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“There has been a real fall in the number of attempted break-ins,” a Eurotunnel spokesman said.

David Cameron has been criticised for his choice of language when addressing the Calais migrant crisis, defending his description of the desperate would-be refugees as a “swarm” and accusing them of trying to “break in” to Britain.

But Eurotunnel said the introduction of extra security personnel had a direct impact on the disruption to freight services and passenger trains, and described the fall in access attempts a “huge improvement”.

In pictures: Calais crisis intensifies

In pictures: Calais crisis intensifies

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Calais crisis

French gendarmes try to stop migrants on the Eurotunnel site in Coquelles near Calais

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Calais crisis

French gendarmes try to stop migrants on the Eurotunnel site in Coquelles near Calais

Getty Images

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Calais crisis

A migrant climbs a security fence of a Eurotunnel terminal in Coquelles near Calais

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A migrant climbs a security fence of a Eurotunnel terminal in Coquelles near Calais

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French gendarmes block migrants along a road to prevent them access to train tracks which lead to the Channel Tunnel in Frethun, near Calais

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Policemen try to prevent migrants from reaching the Channel Tunnel operated by Eurotunnel in Coquelles near Calais

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A policeman faces migrants trying to reach the Channel Tunnel operated by Eurotunnel in Coquelles near Calais

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A policeman tries to stop migrants on the Eurotunnel site in Coquelles near Calais

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Migrants who managed to pass the police block on the Eurotunnel site climb over a fence to make their way towards the boarding docks in Coquelles near Calais

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Migrants are seen near a Channel Tunnel train in Coquelles near Calais

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Migrants trying to reach the Channel Tunnel run past policemen in Coquelles near Calaisa

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Migrants step over the fence as they try to catch a train to reach England, in Calais

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Calais crisis

A migrant climbs a security fence of a Eurotunnel terminal in Coquelles near Calais

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Calais crisis

Migrants warm themselves with a fire as they attempt to access the Channel Tunnel, in Calais

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An Afghan flag flies above makeshift shelters at a site dubbed the "new jungle", where migrants trying to cross the Channel to reach Britain have camped out around the northern French port of Calais

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Migrants build a makeshift shelter around the northern French port of Calais

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Migrants build a makeshift shelter

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Migrants walk in a makeshift camp in Calais

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A driver climbs on his truck as he waits to cross the English channel, in Calais

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Calais crisis

Migrants walk along the roadside while a French policeman secures the area as lorries queue in Calais

Speaking to the BBC, Natalie Chapman from the Freight Transport Association said they had seen a “big reduction” in calls from lorry drivers affected by the Calais crisis.

She said: “We still have concerns about the welfare of drivers... but once they're in the secure compounds around Eurotunnel things seem to be a lot better.”

Later on Sunday the BBC was scheduled to broadcast an edition of Songs of Praise filmed inside a Calais migrant camp known as “the Jungle”, where a group of migrants has built a ramshackle church for Christian worshippers.

The broadcaster has faced criticism over its decision to film there, with a front-page story in the Express calling it a waste of licence fee-payers’ money. But Aaqil Ahmed, the BBC’s head of religion and ethics, said the show would focus on faith not politics.

What happens to migrants if they fail to make it to the UK remains a complicated issue, both "legally and diplomatically", Refugee Studies Centre director Alexander Betts told the BBC.

Most have already passed through one or more safe countries before getting to France - let alone to Britain - and so could in theory be sent back to their point of entry to the EU under the Dublin Regulation.

In practice, with a lack of documentation and often any record of where they landed, this is difficult, and The Local's French edition reports that many Calais migrants have simply become resigned to staying there.

"England would be good, but I'm tired," a 24-year-old Sudanese man called Sadam told The Local. He has decided to apply to stay in France instead.